Statistics Meeting Book (February 20, 2019)

Reference: VIM, International Vocabulary of Metrology – Basic and general concepts and associated terms, 3 rd edition, JCGM 200: 2008 Certified reference material (CRM): Reference material accompanied by documentation issued by an authoritative body and providing one or more specified property values with associated uncertainties and traceability, using valid procedures Notes: Documentation is given in the form of a “certificate” (see ISO guide 30:1992). Procedures for the production and certification of certified reference materials are given, e.g. in ISO Guide 34 and ISO Guide 35. In this definition, “uncertainty” covers both measurement uncertainty and uncertainty associated with the value of the nominal property, such as for identity and sequence. Traceability covers both metrological traceability of a value and traceability of a nominal property value. Specified values of certified reference materials require metrological traceability with associated measurement uncertainty {Accred. Qual. Assur., 2006} ISO/REMCO has an analogous definition {Accred. Qual. Assur., 2006} but uses the modifiers metrological and metrologically to refer to both quantity and nominal properties. Reference: VIM, International Vocabulary of Metrology – Basic and general concepts and associated terms, 3 rd edition, JCGM 200: 2008 New definitions on reference materials, Accreditation and Quality Assurance, 10:576- 578, 2006 Conventional quantity value: quantity value attributed by agreement to a quantity for a given purpose. Notes: The term “conventional true quantity value” is sometimes used for this concept, but its use is discouraged. Sometimes a conventional quantity value is an estimate of a true quantity value. A conventional quantity value is generally accepted as being associated with a suitably small measurement uncertainty, which might be zero. Reference: VIM, International Vocabulary of Metrology – Basic and general concepts and associated terms, 3 rd edition, JCGM 200: 2008